Voltage multiplier



Sept. 3, 1940. w. KALBsKoPF' 2,213,843

VOLTAGE MULTIPLIER Filed Feb. 21, 1939 Patented Sept. 3, 1940 PATENT F FICE VOLTAGE MULTIPIJER Walter Kalbskopf, Nuremberg,

Germany, as-

signor to Suddeutsche Apparate-Fabrik, Nuremberg, Germany, a company Application February 21, 1939, Serial No. 257,695

Germany January 28, 1938 2 Claims.

There are voltage multipliers that have been devised by Marx and others devised by Greinacher. Those of the rst type serve to convert continuous current into current of the same kind,

that is, uni-directional current. This arrangement, however, is only suitable in the case of maximum voltages. The second said arrangement serves to rectify an alternating current and at the same time to multiply the voltage.

U It is also known to produce continuous volt- 4age impulses and to convey these to a circuit arrangement comprising choke coils, condensers and a valve, the object being to convert the primary uni-directional voltage into another 'uni- 5 directional voltage which, for instance, is higher than the former. This arrangement. however, only enables a small multiplication of the cone tinuous voltage.

In accordance with the invention a plurality of condensers and choke coils connected in series are charged over valves by a source of uni-directional voltage impulses. The condensers and choke coils are connected in parallel during the charging process. During the period of dischargi ing into a utilization circuit the condensers are interconnected in series and are connected in series also with the choke coils which in their turn are likewise arranged in series connection. 'I'his will be understood from the following dee scrlption, reference being had to the accompanying drawing, in which Fig. 1 shows the circuit arrangement of one embodiment oi' the invention, while Fig. 2 represents the wiring diagram of an auxiliary arrangement adapted for use with devices according to Fig. 1.

By Ysupplying a voltage impulse of predetermined duration to terminals Al, A2, Fig. 1, rst condensers CI, C2, C3, C4 are charged in parallel connection over valves V. 'I'hereupon a current gradually begins to ilow through choke coils DI, D2, D3 and in the direction indicated by. arrows. Preferably, the duration of the voltage impulses supplied to the terminals A'I, A2 is so chosen that at terminals BI, B2. In addition the self-induction voltages o! the choke coils are effective here,

that is, voltages which are .able to assume high values in consequence of the ileld rapidly disappearing. In this way, at terminals Bl, B2 a total voltage will be effective which is at least as many times greater than the input voltage at 5 the terminals Al, A2 as there are choke coils and condensers, For instance, in the case of'a multiplying arrangement having three choke coils and four condensers a nal voltage of 950 volts was obtained from an input voltage of 100 volts. l0 The valves V included in the supply lines are especially selenium rectiers and prevent the component voltages from compensating one another between the condensers and choke coils. Connected in parallel with the terminals Bl, B2 15 may be a capacity C.

The uni-directional voltage impulses to be supplied to the terminals Al, A2 from a current source A may be produced by ymeans of an interrupter U, Fig. 1, of any type, or by means of the well known glow lamp relaxation arrangement represented in Fig. 2. In the latter case a condenser K is charged over a resistance R. With the glow lamp G attaining its ignition tension condenser K willdi'scharge across this lamp. 25 Such action recurs after the darkening oi' lamp G.

What is claimed is:

1. A voltage multiplier comprising, means for producing uni-directional voltage impulses, a v plurality of condenser and choke coil combinations connected in series, a plurality of unidirective conductive means connecting said condenser choke coil combinations in parallel across said 'source whereby said combinations are eil'ectively in parallel during charging. and an output circuit connected across said series connection of said combinations whereby said combinations are effectively in series in said output during discharging position oi' said means.

2. A voltage multiplier according to claim 1,- 40 wherein said means for producing uni-directive voltage impulses comprises a source of direct current, a condenser connected across said source to be charged thereby, and a glow lamp connected in series with said source and condenser combination whereby when voltage lls up on said condenser from said source said glow lamp ignites to discharge said charge from said condenser.

' WALTER KALBSKOPF. 

